* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    list-style: none;
    font-family: "KaiTi";
}
html, body {
    height: 100vh;
    width: 100%;
}
.container {
    height: 100vh;
    width: 100%;
}

.context {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.form_div {
    height: 300px;
    width: 400px;
    background-color: rgba(200, 200, 200, 0.2);
    z-index: 999;
    border-radius: 20px;
}

#loginForm {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-direction: column;
    height: inherit;
    width: inherit;
}
#loginForm h2 {
    font-size: 2rem;
}
#loginForm button {
    width: 150px;
    height: 30px;
    margin-left: 60px;
    border-radius: 10px;
    /* background-color: rgb(35, 34, 34);
    color: #fff; */
}

.input_div {
    width: 210px;
    height: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.input_div label {
    font-size: 20px;
}

.input_div input {
    width: 150px;
    height: 25px;
    border: 2px solid black;
    border-radius: 20px;
    background-color: rgba(200, 200, 200, 0.7);
    padding-left: 10px;
}
.input_div input:focus {
    background-color: #fff;
}



.context > h1 {
    color: #fff;
    font-size: 3.5rem;
}
.area {
    background-color: #4354c8;
    width: 100%;
    height: 100%;
}
.circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
.circles li {
    position: absolute;
    width: 20px;
    height: 20px;
    display: block;
    background-color: #ffffff33;
    bottom: -150px;
    animation: animate 25s linear infinite;
}
.circles li:nth-child(1) {
    left: 25%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}
.circles li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s; /* 延迟时间 */
    animation-duration: 12s; /* 持续时间 */
}
.circles li:nth-child(3) {
    left: 70%;
    width: 20px;
    height: 20px;
    animation-delay: 4s;
}
.circles li:nth-child(4) {
    left: 40%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 18s;
}
.circles li:nth-child(5) {
    left: 65%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}
.circles li:nth-child(6) {
    left: 75%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}
.circles li:nth-child(7) {
    left: 35%;
    width: 150px;
    height: 150px;
    animation-delay: 7s;
}
.circles li:nth-child(8) {
    left: 50%;
    width: 25px;
    height: 25px;
    animation-delay: 4s;
}
.circles li:nth-child(9) {
    left: 20%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
}
.circles li:nth-child(10) {
    left: 85%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}

@keyframes animate {
    0%{
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }
    100%{
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }
}